This service bulletin provides information for maintenance cleaning of the fuel injectors and gasoline detergent additive.
full bulletin at NHTSA ↗2008 Pontiac Grand Prix engine problems
moderate 16 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
16
Recalls
0
Avg fix
$3,100
When does it fail?
Of the 16 engine complaints filed for the 2008 Pontiac Grand Prix, here's the actual mileage breakdown — failures cluster heaviest at 75,000-100,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
No new NHTSA engine complaint has been filed on this vehicle in over 9 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
full bulletin at NHTSA ↗This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
full bulletin at NHTSA ↗This service bulletin provides technicians with information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
full bulletin at NHTSA ↗This technical bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce carbon build-up.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners of the 2008 Grand Prix describe engine stalls happening without warning at speeds ranging from 10 to 60 mph—coasting, at stop signs, on expressway ramps, anywhere you might not expect it. When it happens, power steering and brakes lose assist, which is the real danger. Most owners manage to put the car in neutral and restart, but some have had the engine crank and refuse to start, requiring tow trucks. Over a year or more, some owners report a dozen or more stall events.
When taken to dealers for diagnostics, a crankshaft position sensor code (P0335) came up once, and that sensor got replaced along with an ignition module, though the dealer wasn't certain the repair would stick. Other shops couldn't find a fault code at all. Owners note the symptoms resemble the GM ignition switch recall, and some received new keys that didn't work while the old key still did.
Beyond stalling, owners report secondary air injection system failures, DREX coolant turning to mud and clogging thermostats, hard restarts after stopping (some needing 15–20 minutes to sit), and recurring check engine lights tied to catalytic converter and emissions issues. One owner had the same cooling system clog twice on separate vehicles. The catalytic converter failures aren't covered by GM warranty if your vehicle wasn't registered in California.
Same Pontiac Grand Prix engine reports on nearby years: 2005 · 2006 · 2007
Failure modes owners describe
Engine stalling while driving
Engine shuts down unexpectedly during normal driving at low to moderate speeds (10-60 mph). Power steering and brakes lose assist when this occurs. Owners have reported the engine will not restart in some instances, requiring towing. Most frequently reported failure mode in this cluster.
When: Low speeds (10-60 mph), coasting, at stop signs, or on expressway ramps. Typically after 60k-130k miles.
Symptoms owners cite: Engine cuts off without warning while driving; Loss of power steering assist; Loss of brake assist; Engine cranks but will not start in some instances; Check engine light may illuminate
Codes mentioned: P0335
Repairs/costs cited: One dealer replaced crankshaft position sensor (part 10456161) and performed emissions system repair; dealer expressed uncertainty the fix would solve the problem. Another owner was given an estimate of $604 for crankshaft position sensor and ignition module replacement. Mechanics unable to duplicate failure during diagnostic testing.
Recalls/TSBs owners mention: Owner noted similarity to GM ignition switch recall. One owner received GM case number 9-5020128648 but vehicle was not repaired. No official recalls mentioned for this stalling issue.
Crankshaft position sensor failure
Diagnostic testing revealed P0335 code indicating crankshaft position sensor malfunction. This sensor failure causes the engine stalling issue described above.
When: At 60k-130k miles
Symptoms owners cite: Engine stalls while driving; P0335 diagnostic code
Codes mentioned: P0335
Repairs/costs cited: Crankshaft position sensor replaced (part number 10456161); repair uncertain to resolve underlying stalling issue.
DREX coolant system clogging
Factory DREX coolant degrades over time, thickening to mud-like consistency and clogging the thermostat and radiator. Owner reports condensation forms naturally in cooling systems through thermal cycling, contaminating the DREX. Owner states this occurred on a second vehicle and required complete cooling system repairs.
When: Occurs progressively; owner had same issue one year prior on same vehicle
Symptoms owners cite: Check engine light may not appear despite coolant degradation; Coolant turns brown and thickens; Thermostat clogs; Engine overheat risk
Repairs/costs cited: Thermostat and cooling system flushed/repaired. Owner states DREX cannot have any fluids added except distilled water.
Recalls/TSBs owners mention: Owner requested recall of all vehicles using DREX coolant.
Secondary air injection system failure
Air injection pump, air control valve solenoid, or air valve failures causing check engine lights. One instance of water damage to air valve. Appears to be chronic issue on 2008 Grand Prix per owner research.
When: At 68k-70k miles
Symptoms owners cite: Check engine light illuminates, cycles on and off; Check engine light stays on continuously
Codes mentioned: P0411
Repairs/costs cited: Air injection pump and air valve replaced. Owner doubted repair would permanently fix issue. Dealer stated repair not covered under warranty.
Ignition switch and related electrical issues
Engine stalling symptoms consistent with ignition switch recall (GM recall for 2008 Grand Prix ignition switches). One owner received recall repair key that did not function; old key still worked. Owner experienced stalling the day after dealer visit. Another owner reports excessive play in ignition switch.
When: Variable; one instance after dealer ignition recall service
Symptoms owners cite: Engine stalls unexpectedly; New recall key does not function; Excessive play in ignition switch; Hard restart after stopping vehicle
Repairs/costs cited: Dealer estimate $604 for crankshaft position sensor and ignition module replacement. Recall key replacement did not resolve stalling.
Recalls/TSBs owners mention: 2008 Grand Prix has known ignition switch recall for stalling symptoms.
Engine hard start and restart difficulty
Vehicle starts okay at times but owner has difficulty restarting after stopping. Vehicle may require 15-20 minutes of sitting before it will start. One owner reports vehicle won't start when fuel tank is full and ignition switch requires two tries.
When: After vehicle has been driven and stopped; also when fuel tank is full
Symptoms owners cite: Hard restart after stopping; Requires 15-20 minute wait to restart; Won't start when fuel tank is full; Ignition switch requires two turns to start
Check engine light issues and emissions-related codes
Recurring check engine light problems with various codes; some appear spurious or difficult to diagnose. EVAP hose issues reported causing check engine light that returns after repair. Multiple owners mention replacing gas caps repeatedly without resolving check engine light.
When: Throughout vehicle operation
Symptoms owners cite: Check engine light cycles on and off; Check engine light stays on continuously
Codes mentioned: P0411, EVAP system code
Repairs/costs cited: Gas cap replaced multiple times without resolving issue. EVAP hose repaired and tested but code returned. Fuel induction cleaning performed at dealer without remedy.
Catalytic converter failure
Catalytic converter failure reported in two narratives, with one owner noting dealer would not cover under warranty because vehicle not registered in California. One failure followed rapid check engine light flashing and jerking acceleration.
When: 60k-70k miles
Symptoms owners cite: Check engine light flashes rapidly; Jerking during acceleration; Engine deceleration
Repairs/costs cited: Possible catalytic converter replacement; cost not covered under warranty if vehicle not registered in California.
Recalls/TSBs owners mention: GM does not cover catalytic converter warranty for non-California registered vehicles.
Oil loss and blue exhaust smoke
Owner reports excessive oil loss without visible leaks and blue smoke from exhaust, indicating internal engine oil consumption or combustion issue.
When: Mileage and timing not specified
Symptoms owners cite: Excessive oil loss with no visible leaks; Blue smoke from exhaust
Oil leak from manifold area
Owner reports oil leak running down manifold, though incident description is unclear (possible confusion with unrelated emergency braking event). Owner mentions similar recalls on other Pontiac model years.
When: After hard braking incident
Symptoms owners cite: Oil leak down manifold
Synthesized from 16 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
The vehicle starts ok at times,but there are times when you drive it and stop some place you have a hard time restarting it. You have to let it sit for about 15 to 20 min then it will start ,there is a lot og play in the ignition,what can the cause be
Excessive loss of oil (none leaking), blue smoke from exhaust. *tr
Had engine trouble with your 2008 Pontiac Grand Prix?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2008 Pontiac Grand Prix?
It's a documented issue but not catastrophic. 16 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Across the 11 complaints that reported odometer mileage, most engine failures cluster between 63,000 and 81,000 miles, with the median around 78,000. A quarter of owners report trouble before 63,000; a quarter make it past 81,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2008/Pontiac/Grand Prix.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.